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Be aware how your voice works. Have you ever pulled the open end of an air filled balloon tight and the air rushes out at a squeal like pitch, then the more you open the balloon, the quieter and lower the pitch gets. This is a literal representation of your vocal chords.
During normal vocalization, only the vocal cords should move. However, sometimes we use the muscles in our neck to help produce sound, leading to muscle strain. You may not be able to see this in a mirror, but through a laryngoscopy, we can see the muscles on the inside of your throat straining when you speak or sing.